Art-tip #9: You can look for help for
different poses from the internet or by taking a picture of yourself / your
kind assistant.

So get up and start posing! xD Google's picture search is as good help though...

Many times for example hands are difficult to draw right but if you use your or someone else's hands as a model you'll get the proportions and posture pretty much right on paper too. When you see the hands in a picture or live it gives you a hint how the hands really look in the certain pose.